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Trouble Code: P1285
Cylinder Head Over-Temperature Sensed
Possible Causes:
Base engine problems or related concerns
CHT sensor has deteriorated or it has failed
Engine coolant level is too low
Engine cooling system has a problem
TSB 10-29-1 contains repair help for this code (LS & T-Bird)
Trouble Code: P1288
Cylinder Head Temperature Sensor Out of Self-Test Range
Possible Causes:
CHT sensor harness connector is damaged
CHT sensor is damaged
Engine coolant level is too low
Engine is cold, or the engine is overheated
Trouble Code: P1289
Cylinder Head Temperature Sensor Circuit High Input
Possible Causes:
CHT sensor circuit is open in the wiring harness, or an open circuit exists in the CHT sensor circuit at the harness connector
CHT sensor is damaged or has failed
Engine coolant level is too low or the thermostat has failed
PCM has failed
Trouble Code: P1290
Cylinder Head Temperature Sensor Circuit Low Input
Possible Causes:
CHT sensor connector is damaged or a short circuit exists
CHT sensor signal circuit is shorted to sensor ground
CHT sensor is damaged or the PCM has failed
Trouble Code: P1299
Cylinder Head Over-Temperature Protection Active
Possible Causes:
Cooling system has a problem
Engine coolant level is too low
A Base Engine problem may be present
TSB 10-29-1 contains repair help for this code (LS & T-Bird)
Trouble Code: P1309
Misfire Monitor Disabled
Possible Causes:
Camshaft position sensor is damaged or it has failed
CKP, ECT or MAF sensors may be out-of-calibration or failed
PCM has failed
TSB 02-22-1 contains repair information for this trouble code
Trouble Code: P1336
CKP or CMP Signal Malfunction
Possible Causes:
Base Engine problem or concern exists
CKP sensor or CMP signal circuit is open or shorted to ground
CKP sensor or CMP sensor is damaged or failed (check for EMI/RFI on this circuit).
PCM has failed
TSB 02-22-1 contains repair information for this trouble code
Trouble Code: P1351
Ignition Diagnostic Monitor Circuit Malfunction
Possible Causes:
Camshaft position sensor may have failed
IDM signal circuit may be open or grounded
CKP, ECT or MAF sensors may be damaged or have failed
PCM has failed
Trouble Code: P1356
PIP Signals Present With Engine Off
Possible Causes:
Ignition Module has failed
PCM has failed
Trouble Code: P1358
IDM Signals Out Of Self-Test Range
Possible Causes:
Ignition Module has failed
PCM has failed
Trouble Code: P1359
Spark Output Circuit Malfunction
Possible Causes:
SPOUT signal circuit may be open (check the connector)
SPOUT signal circuit may be grounded
Ignition Module is damaged or has failed
Trouble Code: P1390
Octane Adjust Circuit Malfunction
Possible Causes:
OCT shorting bar removed
OCT circuit open
PCM has failed
Trouble Code: P1400
DPFE Sensor Circuit Low Input
Possible Causes:
DPF EGR signal circuit shorted to ground
DPF EGR signal VREF circuit open
DPF EGR sensor is damaged or has failed
PCM has failed
TSB 4-3-1 contains repair information for this trouble code
Trouble Code: P1401
DPFE Sensor Circuit High Input
Possible Causes:
DPF EGR signal circuit open, or sensor ground circuit open
DPF EGR signal shorted to VREF or to power
DPF EGR sensor is damaged or has failed
PCM has failed
TSB 4-3-1 contains repair information for this trouble code
Trouble Code: P1405
DPFE Sensor Upstream Hose Off Or Plugged
Possible Causes:
DPF EGR sensor upstream hose is disconnected
DPF EGR sensor upstream hose is plugged (ice)
EGR tube is plugged or damaged
Trouble Code: P1406
DPFE Sensor Downstream Hose Off Or Plugged
Possible Causes:
Check for signs of icing in the hose, or for a restricted tube
DPF EGR sensor downstream hose is disconnected
DPF EGR sensor downstream hose is plugged (ice)
EGR tube is plugged or damaged
Trouble Code: P1409
EGR Vacuum Regulator Solenoid Circuit Malfunction
Possible Causes:
EGR VR solenoid circuit is open, or shorted to ground
EGR VR circuit is shorted to power or the VPWR circuit is open
EGR vacuum regulator solenoid is damaged or the PCM has failed
Trouble Code: P1411
Secondary Air Injection System Downstream Flow
Possible Causes:
Secondary AIR System Electric Pump is damaged
Secondary AIR System Mechanical Pump is damaged
Secondary AIR pump hose is leaking
Secondary AIR pump hose is blocked
Secondary AIR Bypass solenoid passage leaking or blocked
Secondary AIR Bypass solenoid stuck open or stuck closed
Trouble Code: P1413
Secondary AIR System Monitor Circuit Low Input
Possible Causes:
AIR solenoid control circuit is open or it is shorted to ground
AIR pump is damaged or it has failed
Solid State relay is damaged or it has failed
Solid State relay battery power circuit (B+) is open
PCM has failed
Trouble Code: P1414
Secondary AIR System Monitor Circuit High Input
Possible Causes:
AIR Monitor circuit from the pump to the PCM is open
AIR solenoid control circuit is shorted to power
Solid State relay is damaged or has failed
AIR pump ground circuit is open
AIR pump is damaged or has failed
PCM has failed
Trouble Code: P1432
Thermostat Heater Control Circuit Malfunction
Possible Causes:
Thermostat Heater Control (THTRC) circuit open or shorted
Thermostat Heater Control (THTRC) VPWR circuit open
Thermostat Heater assembly is damaged or has failed
PCM has failed
Trouble Code: P1436
A/C Evaporator Temperature (ACET) Circuit Low Input
Possible Causes:
ACET signal circuit shorted to sensor ground (return)
ACET signal circuit shorted to chassis ground
ACET sensor is damaged or has failed
PCM has failed
Trouble Code: P1437
A/C Evaporator Temperature (ACET) Circuit High Input
Possible Causes:
ACET signal circuit is open, or the ground circuit is open
ACET signal is shorted to VREF
ACET sensor is damaged or has failed
PCM has failed
Trouble Code: P1442
EVAP System Small Leak (0.040") Detected
Possible Causes:
Fuel filler cap damaged, cross-threaded or loosely installed
Aftermarket EVAP parts that do not conform to specifications
Small holes or cuts in fuel vapor hoses or EVAP canister tubes
CV solenoid stays partially open when commanded closed
Loose fuel vapor hose/tube connections to EVAP components
EVAP component seals leaking (i.e., leaks in the Purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve)
TSB 03-9-8 contains a repair procedure for this trouble code
TSB 3-20-3 contains a repair procedure for this trouble code
Trouble Code: P1443
EVAP Canister Purge System Malfunction
Possible Causes:
EVAP canister purge valve is damaged or has failed
PF sensor is out-of-calibration or it is "skewed"
PCM has failed
Trouble Code: P1444
Purge Flow Sensor Circuit Low Input
Possible Causes:
PF sensor signal circuit is shorted to sensor or chassis ground
PF sensor is damaged or has failed
PCM has failed
Trouble Code: P1445
Purge Flow Sensor Circuit High Input
Possible Causes:
PF sensor signal circuit shorted to VREF or power (VPWR)
PF sensor signal circuit open or sensor ground circuit open
PF sensor is damaged or has failed
PCM has failed
Trouble Code: P1450
Unable to Bleed Up Fuel Tank Vacuum
Possible Causes:
CV solenoid is stuck partially or fully open or filter is plugged
EVAP canister tube or EVAP canister purge outlet tube blocked or kinked between fuel tank, purge valve and EVAP canister
Fuel filler cap stuck closed (vacuum relief cannot occur)
Contaminated fuel vapor elbow at the EVAP canister, or the EVAP canister is restricted or canister purge valve stuck open
Trouble Code: P1451
EVAP System Canister Vent Solenoid Circuit Malfunction
Possible Causes:
CV solenoid circuit is open, shorted to ground or system power
CV solenoid is damaged or has failed
PCM has failed
Trouble Code: P1452
Fuel Tank Pressure Sensor Circuit Malfunction
Possible Causes:
FTP sensor signal circuit is open or shorted to ground
FTP sensor ground return circuit is open
FTP sensor is damaged or has failed
PCM has failed
Trouble Code: P1455
EVAP System Gross Leak Detected
Possible Causes:
Fuel filler cap missing, loose (not tightened) or the wrong part
FTP sensor signal circuit open or sensor ground circuit open
FTP sensor ground circuit open
FTP sensor is damaged or has failed
PCM has failed
Trouble Code: P1460
Wide Open Throttle A/C Cutout Relay Circuit Malfunction
Possible Causes:
WOT A/C Relay control circuit is open or shorted to ground
WOT A/C Relay VREF circuit is open
WOT A/C Relay is damaged or has failed
PCM has failed
Trouble Code: P1461
A/C Pressure Sensor Circuit High Input
Possible Causes:
ACP sensor circuit shorted to VREF or to power (VPWR)
ACP sensor circuit is open, or the ground circuit is open
ACP sensor is damaged or has failed
PCM has failed
Trouble Code: P1462
A/C Pressure Sensor Circuit Low Input
Possible Causes:
ACP sensor circuit shorted to VREF or to power (VPWR)
ACP sensor circuit is open, or the ground circuit is open
ACP sensor is damaged or has failed
PCM has failed
Trouble Code: P1463
A/C Pressure Sensor Insufficient Pressure Change
Possible Causes:
A/C system mechanical failure, or A/C clutch always engaged
ACP sensor signal open, or sensor ground circuit open
A/C sensor is damaged or the PCM has failed
Trouble Code: P1464
A/C Demand Out of Self-Test Range
Possible Causes:
A/C switch was left "on" during the KOER self-test
A/C PWR circuit is shorted to power (N/C WAC relay contacts)
ACCS circuit is shorted to power
A/C Demand Switch, WAC relay or CCRM is damaged
Trouble Code: P1469
Low A/C Cycling Period
Possible Causes:
Cycling pressure switch circuit open between pin 41 (ACCS) and the PCM, or the IGN RUN circuit is open to the cycling pressure switch circuit (if applicable)
Mechanical A/C system concern (i.e., low refrigerant charge, damaged A/C switch)
Trouble Code: P1473
Fan Secondary High with Fan(s) Off
Possible Causes:
Power-to-Cooling fan circuit open in the wiring harness
Power-to-Cooling fan circuit shorted to power in wiring harness
Cooling fan motor windings open, or fan ground circuit is open
VLCM is damaged or has failed
Trouble Code: P1474
Hydraulic Cooling Fan Primary Circuit Malfunction
Possible Causes:
FC circuit is open or shorted to power
LFC circuit is open or shorted to power (CCRM models)
FC or LFC relay VPWR circuit is open (Start/Run on Probe)
Trouble Code: P1477
Medium Fan Control Primary Circuit Malfunction
Possible Causes:
MFC circuit is open
MFC relay circuit to IGN START/RUN is open
MFC relay is damaged or has failed
PCM has failed
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